SPT 63.5kg, Standard Penetration Test
The standard penetration test is still one of the types of dynamic penetrators.
The difference is that the probe is not a round chase probe, but a standard cylindrical probe (a soil extractor composed of two semicircular tubes). Called the penetrator (split barrel). Therefore, the standard penetration test is to use a certain kinetic energy of hammering to drive a certain specification of split tube penetrator into the soil at the bottom of the borehole, and evaluate the soil based on the penetration resistance in the penetrated soil. The changes and the physical and mechanical properties of the soil. Penetration resistance is expressed by the number of hammers N63.5 of 30 cm penetrated by the penetrator into the soil, also known as the number of penetration hammers.

Specification: